This object specifies the forward signal representing the discriminator digit that separates or distinguishes different information blocks within the forward signaling sequence. This digit is essentially a structural delimiter in the R2 forward-signal stream, so misconfiguring it can cause the receiving exchange to misparse where one information block, such as ANI, ends and another, such as category, begins. If a forward signal stream carries both category and language information back to back, this discriminator digit is what tells the receiving exchange where the category block stops and the language block starts.